Last, the critical factors of data management, analysis reporting, and more » quality assurance are discussed. These guidelines take the reader first through the process of developing a basic study strategy, then through planning and performing the data collection. The guidelines are designed to allow the reader to follow an efficient process to (1) plan the goals and requirements of a magnetic-field study, (2) develop a study structure and protocol, and (3) document and carry out the plan. The purpose of this project was to document widely applicable methods for characterizing the magnetic fields in a given environment, recognizing the many sources co-existing within that space. ![]() For some data sets, the data products will be maintained by other patties who may have their own access procedures. Most of the data products available from the EMF Measurements Database can be downloaded from an Internet site. The number and type of data product will vary by data set. The actual measurement data is contained in data products for each data set. The metadata for each data set is generated according to a specification developed for the EMF Measurements Database. The structured metadata file describes the origin, development, logical and physical structure, and distribution mechanism for each data set. Each data set in the database is formally described by a metadata file. Specifications have been developed for the various elements of the database. Preservation of study descriptions and data is accomplished with a formal, but open, structure. ![]() In addition, the EMF Measurements Database will encourage additional analysis of existing data sets, facilitate analysis of data from multiple projects, support design of new studies, and permit future issues in EMF exposure assessment to be addressed with existing data. Specific objectives of the more » EMF Measurements Database are: o to presewe study descriptions, results and data o to provide readily accessible, well-documented data and - o to facilitate communication among researchers. Primary goals for the EMF Measurements Database are to develop a database structure that can accommodate the diversity of EMF data sets, provide guidance for production of future EMF data sets, and serve as an accessible repository of EMF measurement data. This report describes activities during the period January 1997 to March 1998. The Database is a collection of data sets that relate to measurement of electric and/or magnetic fields. as part of the EMF Research and Public Information Dissemination (EMF RAPID) Program. The EMF Measurements Database project is being implemented by T. The area field is produced by ''area sources'', whose location and field distribution is in general not related to the location of the people in the area. An exposure point is a location where persons engage in fixed, site specific activities near a local source that creates a significant increase in the area field. The magnetic field surveys conducted by this project produced a large amount of data which will form a part of the EMF measurement database Field and exposure data were obtained separately for ''area exposure'' and ''at exposure points''. The surveys used a protocol based on magnetic field measurements and observation of activity patterns, designed to provide estimates of magnetic field exposure by type of people and by type of sources. Of the twenty sites surveyed, 11 were located in the San Francisco Bay Area and 9 in Massachusetts. Magnetic field surveys were performed at four sites for each more » of five environments: schools, hospitals, office buildings, machine shops, and grocery stores. ![]() This project was also to provide information on the contribution of various field sources in the surveyed environments. 3: ''Environmental Field Surveys'' was performed to obtain information on the levels and characteristics of different environments, for which only limited data were available, especially in comparison to magnetic field data for the residential environment and for electric utility facilities, such as power lines and substations. The EMF Research and Public Information Dissemination Program (RAPID) includes several engineering research in the area of exposure assessment and source characterization.
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